Roberto Osuna Quintero (born February 7, 1995) is a Mexican professional baseball pitcher for the Toronto Blue Jays of Major League Baseball (MLB). Osuna was signed by the Blue Jays out of Mexico as a 16-year-old, and played three seasons in their minor league organization. On April 8, 2015, he became the youngest pitcher to appear in a game for the organization, and the first player born in 1995 to play in Major League Baseball.

Osuna made his professional baseball debut with the Diablos Rojos del México of the Mexican League in 2011. In 13 appearances totaling 19 ²⁄₃ innings, he pitched to a 0–1 record, 5.49 earned run average (ERA), and 12 strikeouts. In August 2011, Osuna was acquired by the Blue Jays for $1.5 million. He began the 2012 season with the Bluefield Blue Jays of the Appalachian League, but was promoted to the Vancouver Canadians of the Northwest League after posting a 1–0 record with a 1.50 earned run average in 7 appearances (4 starts). He made his Canadians debut on July 28, 2012, striking out a franchise-record 13 batters over 5 innings pitched. In total, Osuna pitched 43 ²⁄₃ innings in 2012, and posted a 2–0 record, 2.27 ERA, and 49 strikeouts.

On January 29, 2013, Osuna was ranked 90th on MLB's Top 100 Prospects list. He started the 2013 season with the Class-A Lansing Lugnuts of the Midwest League. On May 9, 2013, it was announced that Osuna had torn his ulnar collateral ligament, an injury that usually requires Tommy John surgery. He met with Dr. James Andrews, and was advised to rest and rehab the injury, rather than undergo surgery. Osuna returned from the disabled list on June 9, 2013, and pitched 5 shutout innings for Lansing. Despite his attempt to rehab his elbow, Osuna underwent Tommy John surgery in late June. On July 26, he was ranked 58th on MLB's revised Top 100 Prospects list, and the number 2 prospect in the Blue Jays organization.

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